Event: Division 1 - Open

Opponent Rating Result
Jack Smith 1457 ½ - ½
Mark Furnevall 1909 0 - 1
Chris M Collins 1931 0 - 1
Jack Smith 1457 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1589 = (6754 + 400 * (1 - 2)) / 4)

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